CN113347746B - Heating wire drive circuit and electronic equipment - Google Patents

Heating wire drive circuit and electronic equipment Download PDF

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Publication number
CN113347746B
CN113347746B CN202110906977.XA CN202110906977A CN113347746B CN 113347746 B CN113347746 B CN 113347746B CN 202110906977 A CN202110906977 A CN 202110906977A CN 113347746 B CN113347746 B CN 113347746B
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triangular wave
counting
value
heater
pwm
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CN113347746A (en
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赖哲人
戴兴科
沈再雄
丛峰
陈超
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Shenzhen Weiyuan Semiconductor Co ltd
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Shenzhen Weiyuan Semiconductor Co ltd
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/0019—Circuit arrangements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/0019—Circuit arrangements
    • H05B3/0023—Circuit arrangements for heating by passing the current directly across the material to be heated

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Abstract

The invention provides a heating wire driving circuit and electronic equipment, wherein the heating wire driving circuit comprises a battery, an MOS (metal oxide semiconductor) tube and a PWM (pulse-width modulation) driving circuit, the PWM driving circuit comprises a first triangular wave generating circuit, a second triangular wave generating circuit, a counting circuit and a PWM output circuit, and the frequency of a first triangular wave pulse signal and the frequency of a second triangular wave pulse signal are N times of that of the PWM signals, so that a larger current source can be designed in the triangular wave generator, or a smaller capacitor can be designed in the triangular wave generator, thereby improving the current precision and the anti-interference capability, or reducing the area or the cost of the triangular wave generator, and meanwhile, the duty ratio of the generated PWM signals is the ratio of the square of a target RMS (root mean square) voltage to the square of a heating wire, thereby achieving the purposes of improving the output precision and realizing constant power output.

Description

Heating wire drive circuit and electronic equipment
Technical Field
The invention belongs to the technical field of electronic circuits, and particularly relates to a heating wire driving circuit and electronic equipment.
Background
Many electronic devices require heating control by outputting a voltage to a heater, and the heating power is controlled by the voltage supplied to the heater. Smoke, such as an electronic cigarette, needs to be discharged by a battery to a heater to provide power, which heats an atomizer to produce smoke.
The power of the heating wire is the square of the root mean square value of the voltage at two ends of the heating wire (hereinafter, the root mean square value is abbreviated as RMS value) divided by the resistance value of the heating wire, because the electronic equipment such as an electronic cigarette is powered by a battery, the voltage of the battery is gradually reduced along with the discharging process, in order to keep the output power constant, a control circuit usually uses a MOS transistor to regulate the output power, the specific mode is to regulate the on duty ratio of the MOS transistor, the control method is called a Pulse Width Modulation (PWM) method, as shown in fig. 1, and fig. 1 is a simplified system schematic diagram of the circuit.
The conventional PWM signal outputs a triangular wave signal having an amplitude V through a triangular wave generatorTriangular waveWhen one is lower than VTriangular waveVoltage V ofDCIn comparison with this, the output of the comparator is oneAnd a PWM signal modulated by pulse width, wherein the triangular wave generator provides reference current through a current source and performs charge-discharge switching through a capacitor.
In order to keep the RMS value from varying with the battery voltage, the duty cycle circuit generates a triangular wave signal having a magnitude proportional to the square of the battery voltage based on the battery voltage signal, and compares it with a target signal (the DC voltage of the target signal is proportional to the square of the target RMS value) to generate a Pulse Width Modulation (PWM) signal, as shown in FIG. 2.
However, since the PWM control period is often very low, such as 100Hz to 200 Hz. Taking the example of generating a triangular wave signal with 2V amplitude of 100Hz, if the capacitance inside the triangular wave generator is 5pF, the current of the current source can only be 1 nA. The 1nA current source is difficult to make accurately and is also easily disturbed. If the current source value is increased, the capacitance value needs to be increased in proportion, the volume of the capacitor is correspondingly increased, the area of the triangular wave generator in a chip is greatly increased, and the cost is increased.
Therefore, the conventional heating wire driving circuit has the problem that the precision of the triangular wave generator is too low or the cost is too high due to the low PWM control period.
Disclosure of Invention
The invention aims to provide a heating wire driving circuit, and aims to solve the problem that the precision of a triangular wave generator is too low or the cost is too high due to the low PWM control period of the traditional heating wire driving circuit.
A first aspect of an embodiment of the present invention provides a heater driving circuit, where the heater driving circuit includes a battery, an MOS transistor, and a PWM driving circuit, the battery, the MOS transistor, and the heater are sequentially connected, the PWM driving circuit is respectively connected to a gate and an output of the MOS transistor, and the PWM driving circuit includes:
a first triangular wave generator for outputting a first triangular wave pulse signal, the frequency of the first triangular wave pulse signal being in a direct proportional relationship with the square of the target RMS voltage;
a second triangular wave generator for outputting a second triangular wave pulse signal, a frequency of the second triangular wave pulse signal being in a direct proportional relationship with a square of a terminal voltage of the heating wire, a value of the square of the terminal voltage of the heating wire being larger than a value of the square of the target RMS voltage;
the counting circuit is used for synchronously and respectively counting the first triangular wave pulse signal and the second triangular wave pulse signal and outputting a first counting value and a second counting value, wherein the first counting value is reset when counting to a target counting value, the second counting value is reset when counting to the target counting value, and the counting is started at the current reset time point of the first counting value;
and the PWM output circuit is used for acquiring a first count value and a second count value output by the counting circuit and corresponding counting duration and outputting a PWM signal, wherein the period of the PWM signal is the reset interval time of the first count value, and the duty ratio of the PWM signal is the ratio of the duration from the reset time point of the first count value to the reset time point of the second count value in each period to the reset interval time of the first count value.
In one embodiment, the counting circuit comprises:
the first counting unit is connected with a signal output end of the first triangular wave generator and used for counting the first triangular wave pulse signals, outputting a first counting value and resetting and counting when the first triangular wave pulse signals are counted to a target counting value;
and the second counting unit is connected with the signal output end of the second triangular wave generator and used for counting the second triangular wave pulse signals and outputting a second counting value, resetting when the second triangular wave pulse signals are counted to a target counting value, and starting to count again at the resetting time point of the first counting value.
In one embodiment, the first triangular wave generator comprises a first current source, a first capacitor, a first electronic switch tube and a first comparator;
the power output end of the first current source, the first end of the first capacitor, the first end of the first electronic switch tube and the positive phase input end of the first comparator are interconnected, the second end of the first capacitor and the second end of the first electronic switch tube are both grounded, the reverse phase input end of the first comparator is used for inputting preset reference voltage, and the output end of the first comparator and the controlled end of the first electronic switch tube are connected in common and form the signal output end of the first triangular wave generator.
In one embodiment, the ratio of the square of the target RMS voltage divided by the resistance of the heater to the current of the first current source is 1: K.
in one embodiment, the second triangular wave generator comprises a second current source, a second capacitor, a second electronic switch tube and a second comparator;
the power output end of the second current source, the first end of the second capacitor, the first end of the second electronic switch tube and the positive phase input end of the second comparator are interconnected, the second end of the second capacitor and the second end of the second electronic switch tube are both grounded, the negative phase input end of the second comparator is used for inputting preset reference voltage, and the output end of the second comparator and the controlled end of the second electronic switch tube are connected in common and form the signal output end of the second triangular wave generator.
In one embodiment, a ratio of a value obtained by dividing a square of the terminal voltage of the heating wire by a resistance value of the heating wire to a current value of the second current source is 1: K.
in one embodiment, the first counting unit comprises a first counter.
In one embodiment, the second counting unit comprises a second counter.
In one embodiment, the PWM output circuit includes an RS register.
A second aspect of an embodiment of the present invention provides an electronic device, which includes a heating wire and the heating wire driving circuit as described above, where the heating wire driving circuit is electrically connected to the heating wire.
The embodiment of the invention adopts the first triangular wave generator, the second triangular wave generator, the counting circuit and the PWM output circuit to form the PWM driving circuit, the frequency of the first triangular wave pulse signal and the second triangular wave pulse signal is N times of the PWM signal, wherein N is equal to a target counting value, therefore, a larger current source can be designed in the triangular wave generator, or a smaller capacitor can be designed in the triangular wave generator, thereby improving the current precision and the anti-interference capability, or reducing the area or the cost of the triangular wave generator, simultaneously, the frequency of the first triangular wave pulse signal and the frequency of the second triangular wave pulse signal are respectively in direct proportion to the square of the target RMS voltage and the square of the terminal voltage of the heating wire, the duty ratio of the generated PWM signal is the ratio of the square of the target RMS voltage and the square of the terminal voltage of the heating wire, and the influence of the conduction resistance of the MOS tube is avoided, thereby achieving the purposes of improving the output precision and realizing the constant power output.
Drawings
Fig. 1 is a schematic structural diagram of a conventional heater driving circuit;
FIG. 2 is a waveform diagram of a conventional PWM signal;
fig. 3 is a schematic diagram of a first structure of a heater driving circuit according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a first structure of a PWM driving circuit in the heater driving circuit shown in FIG. 3;
FIG. 5 is a schematic waveform diagram of a PWM signal in the heater driving circuit shown in FIG. 4;
FIG. 6 is a second structural diagram of a PWM driving circuit in the heater driving circuit shown in FIG. 3;
fig. 7 is a third structural diagram of the PWM driving circuit in the heater driving circuit shown in fig. 3.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Example one
As shown in fig. 3, fig. 3 is a schematic diagram of a first structure of a heater driving circuit according to an embodiment of the present invention, where the heater driving circuit includes a battery BAT, a MOS transistor Q11, and a PWM driving circuit 100, the battery BAT, the MOS transistor Q11, and the heater R are sequentially connected, and the PWM driving circuit 100 is connected to a gate and an output of the MOS transistor Q11, respectively.
The power supply end of the battery BAT is connected with the input end of the MOS tube Q11 and used for providing a driving power supply, the PWM driving circuit 100 obtains the terminal voltage of the heating wire R and converts and outputs a PWM signal to the MOS tube Q11, the MOS tube Q11 is correspondingly turned on according to the PWM signal and converts and outputs the required voltage and current to the heating wire R, constant power output is achieved, the PWM driving circuit 100 performs constant power output control according to the terminal voltage of the heating wire R, the influence of the on-resistance of the MOS tube Q11 is reduced, and the output precision is improved.
As shown in fig. 4, the PWM driving circuit 100 includes:
a first triangular wave generator 10 for outputting a first triangular wave pulse signal having a frequency in direct proportion to the square of the target RMS voltage;
a second triangular wave generator 20 for outputting a second triangular wave pulse signal whose frequency is in a direct proportional relationship with the square of the terminal voltage of the heating wire R, the value of the square of the terminal voltage of the heating wire R being larger than the value of the square of the target RMS voltage;
the counting circuit 30 is respectively connected with the first triangular wave generator 10 and the second triangular wave generator 20, and the counting circuit 30 is used for synchronously and respectively counting the first triangular wave pulse signal and the second triangular wave pulse signal and outputting a first counting value and a second counting value, wherein the first counting value is reset when counting to a target counting value, the second counting value is reset when counting to the target counting value, and the counting is started at the current reset time point of the first counting value;
and the PWM output circuit 40 is connected to the counting circuit 30, and the PWM output circuit 40 is configured to obtain a first count value and a second count value output by the counting circuit 30 and a corresponding counting duration and output a PWM signal, where a cycle of the PWM signal is a reset interval time of the first count value, and a duty ratio of the PWM signal is a ratio of a duration from a reset time point of the first count value to a reset time point of the second count value in each cycle to a reset interval time of the first count value.
In this embodiment, the first and second triangular wave generators 10 and 20 are each internally provided with a current source and a capacitor, and output a corresponding triangular wave pulse signal according to the charge-discharge conversion of the current source to the capacitor, wherein the frequency of the first triangular wave pulse signal output by the first triangular wave generator 10 is proportional to the square of the target RMS voltage, the frequency of the second triangular wave pulse signal output by the second triangular wave generator 20 is proportional to the square of the terminal voltage of the heating wire R, the counting circuit 30 synchronously counts the two triangular wave pulse signals and feeds back a first count value and a second count value to the PWM output circuit 40, when the count reaches a preset target value, the counting is reset respectively, and since the square value of the terminal voltage of the heating wire R is greater than the square value of the target RMS voltage, the second count value reaches the target preset value first, as shown in fig. 5, l2 represents the second count value, L1 represents the first count value, after receiving the two count values, the PWM output circuit 40 takes the time interval between two reset time points of the first count value as the period time TS of the PWM signal, and takes the ratio of the time length from the start of counting to the time point of reaching the target preset value of the second count value to the reset interval time of the first count value in each period time as the value of the duty ratio, and outputs the PWM signal, the duty ratio D of which is simultaneously equal to D = VRMS 2/VR 2And the PWM signal is output to the MOS tube Q11 to carry out constant power output, so that the output precision is improved.
Meanwhile, through the counting circuit 30, the frequency of the triangular wave pulse signal is N times of the frequency of the PWM signal, N is a target preset value, for example, 256, when the frequency of the PWM signal is 100HZ, the frequency of the triangular wave pulse signal can reach 25.6KHZ, which is much larger than 100HZ, because the current value of the current source inside the triangular wave generator is directly proportional to the frequency of the triangular wave pulse signal, and the capacitance value of the capacitor inside the triangular wave generator is inversely proportional to the frequency of the triangular wave pulse signal, the current value of the current source can be designed to be larger, the precision and the anti-interference capability of the current source are improved, or the capacitance value of the capacitor inside the triangular wave generator can be designed to be smaller, and the area and the cost of the triangular wave generator are reduced.
The reset time of the second count value can be controlled by the internal circuit of the counting circuit 30 or the PWM output circuit 40, so as to reset and recount after each period of the PWM signal is finished, or be driven and controlled by an external control signal, which is specifically set according to the requirement.
The specific structure of each triangular wave generator is designed according to the requirement, and may include other components such as a current source and a capacitor, respectively, as shown in fig. 7, in an embodiment, the first triangular wave generator 10 includes a first current source IC1, a first capacitor C1, a first electronic switch Q1, and a first comparator U1;
a power supply output end of the first current source IC1, a first end of a first capacitor C1, a first end of a first electronic switch Q1 and a non-inverting input end of a first comparator U1 are interconnected, a second end of the first capacitor C1 and a second end of the first electronic switch Q1 are both grounded, an inverting input end of the first comparator U1 is used for inputting a preset reference voltage Vth, and an output end of the first comparator U1 and a controlled end of the first electronic switch Q1 are connected in common and constitute a signal output end of the first triangular wave generator 10.
The second triangular wave generator 20 comprises a second current source IC2, a second capacitor C2, a second electronic switch tube Q2 and a second comparator U2;
a power supply output end of the second current source IC2, a first end of a second capacitor C2, a first end of a second electronic switch Q2 and a non-inverting input end of a second comparator U2 are interconnected, a second end of the second capacitor C2 and a second end of the second electronic switch Q2 are both grounded, an inverting input end of the second comparator U2 is used for inputting a preset reference voltage Vth, and an output end of the second comparator U2 and a controlled end of the second electronic switch Q2 are connected in common and constitute a signal output end of the second triangular wave generator 20.
In this embodiment, the basic structure and the operation principle of the first triangular wave generator 10 and the second triangular wave generator 20 are the same, that is, each current source outputs current and charges in the corresponding capacitor, when the terminal voltage of the capacitor is greater than the preset reference voltage Vth, the corresponding comparator outputs a high level and controls the electronic switch tube to conduct and discharge, when the terminal voltage of the capacitor is less than the preset reference voltage Vth, the comparator outputs a low level to control the electronic switch tube to turn off and stop discharging, the capacitor continues to charge, so as to charge and discharge the capacitor according to the on and off of the electronic switch tube, and correspondingly, the two comparators output the first triangular wave pulse signal and the second triangular wave pulse signal respectively.
Meanwhile, in order to obtain a triangular wave pulse signal of a desired frequency, the first triangular wave generator 10 sets a current source of a corresponding magnitude by a target RMS voltage, and the second triangular wave generator 20 sets a current source of a corresponding magnitude by obtaining a terminal voltage of the heating wire R, and in one embodiment, a ratio of a square of the target RMS voltage to a resistance value of the heating wire R to a current value of the first current source IC1 is 1: k, a ratio of a square of the terminal voltage of the heating wire R to a resistance value of the heating wire R to a current value of the second current source IC2 is 1: k, i.e. IC1= KVRMS 2/R，IC2=KVR 2/R such that the duty cycle value of the PWM signal generated by the counting circuit 30 is VRMS 2/VR 2。
The counting circuit 30 may employ a single counting module or a plurality of counting modules to count respectively, as shown in fig. 6, and in one embodiment, the counting circuit 30 includes:
and the first counting unit 31 is connected with a signal output end of the first triangular wave generator 10, and the first counting unit 31 is used for counting the first triangular wave pulse signals and outputting a first counting value, and resetting and counting when the first triangular wave pulse signals are counted to a target counting value.
And the second counting unit 32 is connected with a signal output end of the second triangular wave generator 20, and the second counting unit 32 is used for counting the second triangular wave pulse signals and outputting a second counting value, resetting when the target counting value is counted, and starting to count again at the resetting time point of the first counting value.
The first counting unit 31 and the second counting unit 32 synchronously count the two triangular wave pulse signals, and feed back a first count value and a second count value to the PWM output circuit 40, reset and count when the count value presets a target value, since the square value of the terminal voltage of the heater R is greater than the square value of the target RMS voltage, the second count value reaches the target preset value first, as shown in fig. 5, L2 represents the second count value, L1 represents the first count value, after receiving the two count values, the PWM output circuit 40 takes the time interval of two reset time points of the first count value as the period time TS of the PWM signal, and at the same time, takes the duration of the second count value from the start of counting to the time point of reaching the target preset value in each period time as the value of the duty ratio, and outputs the PWM signal, wherein the duty ratio D is equal to D = VRMS 2/VR 2And the PWM signal is output to the MOS tube Q11 to carry out constant power output, so that the output precision is improved.
The second counting unit 32 starts to count again at the reset time point of the first counting value, and the second counting unit 32 may be controlled by the reset time point by an external control signal or specifically controlled by the PWM output circuit 40, which is not particularly limited herein.
The first counting unit 31 and the second counting unit 32 may adopt the same or different counting modules, as shown in fig. 7, in one embodiment, the first counting unit 31 includes a first counter 311, the second counting unit 32 includes a second counter 321, and the first counter 311 and the second counter 321 adopt counters with the same number of bits, for example, an 8-bit counter and a 16-bit counter, which are correspondingly arranged according to the precision and the area of the triangular wave generator.
The PWM output circuit 40 may adopt signal conversion modules with different structures, as shown in fig. 7, in an embodiment, the PWM signal includes an RS register 41, a setting signal end of the RS register 41 is connected to the first triangular wave generator 10, a reset signal end of the RS register 41 is connected to the second triangular wave generator 20, and the RS register 41 correspondingly outputs the PWM signal according to the received count value.
The invention further provides an electronic device, which includes a heating wire and a heating wire driving circuit, and the specific structure of the heating wire driving circuit refers to the above embodiments.
In this embodiment, the heater drive circuit provides current and voltage for the heater, realizes constant power drive, and electronic equipment can be structures such as electron cigarette, all kinds of heaters, and the concrete use scenario is not limited.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims (10)

1. The utility model provides a heater drive circuit, heater drive circuit includes battery, MOS pipe and PWM drive circuit, its characterized in that, the battery MOS pipe and heater connect gradually, PWM drive circuit with the grid and the output of MOS pipe are connected respectively, PWM drive circuit includes:
a first triangular wave generator for outputting a first triangular wave pulse signal, the frequency of the first triangular wave pulse signal being in a direct proportional relationship with the square of the target RMS voltage;
a second triangular wave generator for outputting a second triangular wave pulse signal, a frequency of the second triangular wave pulse signal being in a direct proportional relationship with a square of a terminal voltage of the heating wire, a value of the square of the terminal voltage of the heating wire being larger than a value of the square of the target RMS voltage;
the counting circuit is used for synchronously and respectively counting the first triangular wave pulse signal and the second triangular wave pulse signal and outputting a first counting value and a second counting value, wherein the first counting value is reset when counting to a target counting value, the second counting value is reset when counting to the target counting value, and the counting is started at the current reset time point of the first counting value;
and the PWM output circuit is used for acquiring a first count value and a second count value output by the counting circuit and corresponding counting duration and outputting a PWM signal, wherein the period of the PWM signal is the reset interval time of the first count value, and the duty ratio of the PWM signal is the ratio of the duration from the reset time point of the first count value to the reset time point of the second count value in each period to the reset interval time of the first count value.
2. A heater driver circuit according to claim 1, wherein the counter circuit comprises:
the first counting unit is connected with a signal output end of the first triangular wave generator and used for counting the first triangular wave pulse signals, outputting a first counting value and resetting and counting when the first triangular wave pulse signals are counted to a target counting value;
and the second counting unit is connected with the signal output end of the second triangular wave generator and used for counting the second triangular wave pulse signals and outputting a second counting value, resetting when the second triangular wave pulse signals are counted to a target counting value, and starting to count again at the resetting time point of the first counting value.
3. A heater driving circuit according to claim 2, wherein the first triangular wave generator includes a first current source, a first capacitor, a first electronic switching tube, and a first comparator;
the power output end of the first current source, the first end of the first capacitor, the first end of the first electronic switch tube and the positive phase input end of the first comparator are interconnected, the second end of the first capacitor and the second end of the first electronic switch tube are both grounded, the reverse phase input end of the first comparator is used for inputting preset reference voltage, and the output end of the first comparator and the controlled end of the first electronic switch tube are connected in common and form the signal output end of the first triangular wave generator.
4. A heater driving circuit according to claim 3, wherein a ratio of a value of a square of the target RMS voltage divided by a resistance value of the heater to a current value of the first current source is 1: k, wherein K is a proportionality coefficient and is greater than zero.
5. A heater driving circuit according to claim 2, wherein the second triangular wave generator includes a second current source, a second capacitor, a second electronic switching tube, and a second comparator;
the power output end of the second current source, the first end of the second capacitor, the first end of the second electronic switch tube and the positive phase input end of the second comparator are interconnected, the second end of the second capacitor and the second end of the second electronic switch tube are both grounded, the negative phase input end of the second comparator is used for inputting preset reference voltage, and the output end of the second comparator and the controlled end of the second electronic switch tube are connected in common and form the signal output end of the second triangular wave generator.
6. A heater driving circuit according to claim 5, wherein a ratio of a value of a square of a terminal voltage of the heater divided by a resistance value of the heater to a current value of the second current source is 1: k, wherein K is a proportionality coefficient and is greater than zero.
7. A heater driver circuit according to any one of claims 2-6, wherein the first counter unit includes a first counter.
8. A heater driver circuit according to any one of claims 2-6, wherein the second counter unit includes a second counter.
9. A heater driver circuit according to any one of claims 1-6, wherein the PWM output circuit includes an RS register.
10. An electronic apparatus comprising a heater and the heater driving circuit according to any one of claims 1 to 9, wherein the heater driving circuit is electrically connected to the heater.
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